package com.ln.service.impl;

import com.ln.dao.StockDao;
import com.ln.entity.Stock;
import com.ln.service.StockService;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.ValueOperations;
import org.springframework.stereotype.Service;

import java.util.concurrent.TimeUnit;

/**
 * @author Ln
 * @version 终极版
 * @date 2022/12/8 16:01
 */
@Service
public class StockServiceImplredisson implements StockService {
    @Autowired
    private StockDao stockDao;

    @Autowired
    private RedissonClient redisson;

    @Override
    public String decrement(int isbn) {
        //获取锁对象
        RLock lock = redisson.getLock("stock::" + isbn);
        //必须为30秒
        lock.lock(30,TimeUnit.SECONDS);
        try {
            //1. 查找指定商品的库存
            Stock stock = stockDao.selectById(isbn);
            //2. 判断库存数是否大于0
            if (stock.getStock() > 0) {
                //3.减库存
                stock.setStock(stock.getStock() - 1);
                stockDao.updateById(stock);

                System.out.println("商品编号为:" + isbn + "的商品库存剩余:" + stock.getStock() + "个");
                return "商品编号为:" + isbn + "的商品库存剩余:" + stock.getStock() + "个";
            } else {
                System.out.println("商品编号为:" + isbn + "的商品库存不足。");
                return "商品编号为:" + isbn + "的商品库存不足。";
            }

            }finally {
            //释放锁
                lock.unlock();
            }

        }

}
